HV hookup wire Braid to help with HF protection

To: "'Tesla List'" <tesla-at-pupman-dot-com>
Subject: HV hookup wire Braid to help with HF protection
From: Tesla List <tesla-at-stic-dot-net>
Date: Wed, 4 Mar 1998 20:34:30 -0600
Approved: tesla-at-stic-dot-net


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From:  Christopher Stone [SMTP:Chris.Stone-at-etak-dot-com]
Sent:  Wednesday, March 04, 1998 4:38 AM
To:  tesla-at-pupman-dot-com
Subject:  Re: HV hookup wire Braid to help with HF protection


> 
> 
> ----------
> From:  Malcolm Watts [SMTP:MALCOLM-at-directorate.wnp.ac.nz]
> Sent:  Tuesday, March 03, 1998 3:32 PM
> To:  Tesla List
> Subject:  Re: HV hookup wire
> 
> Hi Eleanor,
> 
> > From:  Eleanor Flood [SMTP:eflood-at-bellsouth-dot-net]
> > Sent:  Wednesday, January 14, 1998 5:30 PM
> > To:  tesla-at-pupman-dot-com
> > Subject:  HV hookup wire
> > 
> > In place of ignition wire, HV hook up wire can be constructed, cheaply,
> > by purchasing black plastic tubing, about the size of a pencil, normally
> > used for micro-irrigation purposes and available at large builder's
> > supply stores and some garden centers.  The tubing will hold up well
> > under HV.  We use silver coated braid obtained from coaxial cable and
> > use a wire with a small hook bent on the end to snake the braid through
> > the desired length connection.  Stiff wire is much easier to use and the
> > tubing will accommodate up to a size 8 wire.
> > If you are using caps in oil, clamp one end to prevent siphoning of oil.
> > Works for us.
> > Maybe better explain how we clamp it.
> > A very effective clamp can be made from 1/4" copper tubing cut in 1/4 "
> > lengths, slipped over the end of the plastic tubing and crimped with a
> > pair of pliers.  This stops any leaks.
> > Harold and Elli
> 
> Braid is not a good thing to include in high frequency resonant 
> circuits, silver plated or not. Skin effect adds enormously to the 
> resistance of braid. In trying to stay near the overall conductor 
> surface, the current has to hop from strand to strand so in using 
> braid, you are including hundreds of connections of dubious quality 
> in the wire. It would be OK to use between the transformer and the 
> spark gap, but nowhere else. The high I^2.R losses in it make 
> themselves known as heating in the wire.
> 
> Malcolm
> 
> 
> 
Wouldn't this very property be useful on the protection circuit 
for the transformer.  It seems like it would allow the 60 Hz out 
of the transformer and help to cut the HF kickbacks dow a bit.

Chris